Underreamer



W. C. CUTLER.

UNDERREAMER.

APPLICATION FlLED JAN. 9. 1920.

1,358,298, Patented Nov. 9, 1920;

UNITED sTArss PATENT OFFICE.

WILLIAM G. CUTLER, OF NORTH GLENDALE, CALIFORNIA.

UNDERBEAMER.

Application filed January 9, 1920. Serial No. 350,422.

To all whom it may concern:

Be it known that'I, lVILLIaM C. CUTLER, a citizen of the United States, residing at North Glendale in the county of Los Angeles and State of Caliiornimhave invented new and useful Improvements in Underreamers, of whichthe following is a speci iication.

This invention relates to devices for underreaming a deep well below the casing in the well, and more particularly it refers to the device disclosed in my previous application, filed March 6, 1917, Serial No. 152,855, wh ch application resulted in the Patent No. 1,239,087 of September 1, 1917.

One of the objects of this invention is to prevent the reaming members from turning within the body.

Another object is to provide means for swingably holding the reaming members within the body allowing an oscillating movement of the reaming members in a normally vertical plane in relation to the body of the reamer while preventing the reaming members from turning within the body in a normally horizontal plane.

Other objects will appear from the followinn" description and appended claims as well as from the accompanying drawing, in which-- Figure 1 is a longitudinal midsectional view through the operating portion of the device.

Fig. 2 is a cross section on line 2-2 of Fig. 1.

Fig. 3 is a fragmentary longitudinal midsectional view sim lar to Fig. 1. illustrating a sli htly modified means for preventing the reaming members from turning within the body.

Fla. 4 is a cross ection throuqh the interlo lr n means of Fig. 3. talren on line 4-:4.

Similar numbers refer to similar parts throur hout the several views.

The body5 is provided with a bore 6. which is suitably enlarged near the lower end of the body. as indicated at 7. In the lower end of the body. the bore is mach ned out to leave fl t surfaces 8. see Fig. 2. The neck ends 9 of the reaming members 1 and 11 are flattened oil on the sides as indicated at 12 to engage with the irregular sides of the lower end of the bore to prevent the reaming members from turning in a nor mally horizontal plane while allowing an osclllating movement in a normally vertical plane. The irregular portion 8 of the bore, of course, does not have to be just fiat on the two opposite sides while the remaining por tion appears to be machined out in a practically cylindrical shape, but it will easily be understood that the main thing is to provide some kind of irregular form in that portion of the bore as the simplest means for preventing the turning of the reaming members within the body. It'is easy to bore out the body, enlarge that bore 6 as at 7 while leaving the lower portion at first as small as the original bore 6, and then chipping or machining that lower portion to some irregular form to engage properly with the correspondingly shaped reaming members to prevent the reaming members from turning, but it will also easily be understood that other ways of forming some kind of irregular form within the body to engage with some correspondingly formed portion of the ream ng members can be pro vided to do the same thing, namely to enpage the reaming members swinrrablv while they are prevented from turning within the body in a normally horizontal plane.

In Figs. 3 and 4 is a slight modification of the disclosure made above in regard to preventing'the reaming members from turning within the body in a normally horizontal plane while free to move in a normally vertical plane. the oscillating movement in the vertical plane being the normal movement necessary ina reamer to allow the collapsing and expanding of the reaming members in relation to the body during the normal operations of the tool.

Both forms provide a shoulder 13 at the lower termination of the recessed portion 7 ot' the bore 6 for the projecting portions 14 of the reaming members to swingably engage with the body.

The washer 15, in the modified form of Figs. 3 and 4. is provided with an upwardly extending cylindrical portion 16, over which the guiding tube 17 is tightly pressed. This portion 16 is slotted as indicated at 18 before the tube 17 is put in place, to allow the separating pin 19. to drop between the reaming members through the washer. The

washer is thus properly engaged with the pin 19, preventing the pin from turning within the washer. The washer is then furthermore provided with a suitable number of pins 20 to slide and engage with a corresponding nvmber of bores 21, which prevents a turning ofthe washer-in relation to the body 5, since the bores '21 are provided in the body. By this arrangement, the reaming members are swingably engaged with the body while prevented from turning on a normally horizontal plane.

Fromgthe above it will be understood that I do not wishto" limit myself tothe construction of any particular device, but that I mainly intend to provide means for preventing the reaming members from turning in a normally horizontal plane while swingably engaged within the body of the reamer.

The spring 22 is inserted into the bore 6 of the bodyb, asjil-lustrated in Fig. 1; above the washer 15 to normally press upon the top ends oifthje reaming members for holding such reaming members in the normally expanded position.

Having thus described my invention, I cla m: I r

=1. In-an under reamer a body having a recessed bore terminatingin a noncylindrical portion of smaller dimensions than the recessed portion ust above thereby forming a supporting shoulder inside of the bore at the lower termination tion.

2. In an under reamer, a body having a of the recessed porrecessed bore terminatingin a noncylindri- WILLIAM G. CUTLER.

Witnesses: i

J} B. TABOURT Gno. H. HnNoH AN; 

